math

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Simplify and evaluate using distributive property of multiplcation

3x-4(2x-5)

I've tried many ways and can't come up with the same answer as the teacher. help please?

  • math -

    What answer does your teacher have?

  • math -

    3x8x+20

  • math -

    No. 3x-8x+20=-5x+20 or 5(4-x)

  • math -

    ok..i guess that is where i'm confused

    3x-4(2x-5)

    3x-(4X2x-4X5)

    3x-(8x-20) (this was my answer)

    I still not sure how the teacher and you came up with +20 instead of -20?

  • math -

    Two minuses make a plus.

  • math -

    3x-(4X2x-4X5)
    The - outside the parentheses changes the sign of everything inside the parentheses. Therefore, the 4*3x becomes -(8x) or -8x and the -4*5 becomes -(-20) or + 20.

  • math -

    use the number line.is 458 closer to 450 or to 460

  • to tyqwanza -

    If you have a separate question to post, go to the top of the page and click on post a new question. Piggy backing onto another question rarely results in an answer for the piggy backer.

  • math -

    Than you all. Dr. Bob222 that was exactly what I was missing, I could not see where the 2 minuses where together since our teacher explained it differently. This was very clear.
    Thank you.

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